How to ALWAYS open documents in external application/viewer?

I hate the feature that MM by default always opens documents in the "browser" at the right-hand side! I find that view always too small and useless, esp. when I actually want to edit a file, I then - in a second step - always have to click on the "Open Outside MM" button first.

Rather I want this to be the default, the corresponding document should always and directly open in its appropriate external viewer or editor application.

In earlier versions there used to be an option that one could set to make this the default behavior, but I can't find that open anywhere in my installed version (v14.3.192). Is that feature gone or where does it hide?